Microtelephonic apparatus.



No. 673,5l'2. Patented May 7, I901.

J. BERLINER.

MICRUTELEPHONIC APPARATUS.

(Application filed Dec. 4. 1900.-

2 Sheets-Sheet I.

(No Model.)

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No. 673,512. Patented May 7, l90l.

. J. BERL|NER.-

MICBOTELEP HONIG APPARATUS.

(Application filed Dec. 4, 1900.)

(No Model) 2 Sheets-Sheet 2.

UNITED STATES.

PATENT OFFICE.

JAooB BERLINER, on HANOVER, GERMANY.

M ICROTE LEPHONIC APPARATUS.

SPECIFICATION forming part of Letters Patent N 0. 673,512, dated May '7, 1901. Application filed December 4, 1900. Serial No. 38,711. (No model.)

To all whom it may concern.-

Be it known that I, J AOOB BERLINER, a subject of the King of Prussia, Emperor of Germany, residing at No. 24 Kornerstrasse, Hanover, Kingdom of Prussia, German Empire, have invented a new and useful Microtelephonic Apparatus, of which the following is a specification.

The object of my invention is to construct a microtelephonic apparatus which differs from those hitherto in use in that the part by which the apparatus is taken hold of contains a tapper-switch consisting of two parts,one of which closes, when depressed, the call-bell circuit, while the other closes the microphonic circuit on being pressed down. The sending-microphone and the receiver are connected to each other by an intermediate hollow piece, preferably of wood, having attached to it by means of a screw connected to the line a spring-blade, on the face of which are connected two strips of insulating material. The ends of the spring-blade are held by its elasticity away from contacts connected the one to the call-bell circuit and the other to the microphonic circuit. On the former end of the tapper being depressed the call-bell circuit is closed, while the depressing of the other end closes the microphone-circuit.

The preferred form of my invention is shown in the accompanying drawings, in which- Figure 1 is a longitudinal section of the microtelephonic apparatus built according to my invention. Fig. 2 is a front view of same, and Fig. 3 a diagram showing the run of the circuits.

In the drawings, a is the microphone, b the telephone, and g a connecting member between the telephone and microphone.

While in the usual apparatus of this class a special push or knob independent of the apparatus has to be depressed in order to call a correspondent, the call-bell contact-maker is according to the present invention so combined with the switching device for themicrophone that the aforesaid tapper-switch consists of two parts, one of which closes, on being depressed, the call-bell circuit, while the other on being so acted on closes the microphone-circuit.

As shown in the drawings, the connecting member g is provided with a screw d, connected to the line and serving to fix to the connecting-piece a spring-blade h, to which are attached the insulating-pieces e and f, which on being depressed cause the ends of the spring-blade to contact with contact spring-blade and connected to the call-bell circuit and a contact-screw opposite the other end of the spring-blade and connected to the microphonic circuit, substantially as described.

In testimony whereof I have hereunto set I a contact-screw opposite to the one end of the my hand in presence of two subscribing witnesses.

JACOB BERLINER. Witnesses:

S. GOLDSCHMIDT, Ge. FISCHER. 

